Two polyether macrocycles are “threaded” when the dication 1 is cyclized with 4,4′-dibromomethylbiphenyl (2) in the presence of these macrocycles. NMR spectroscopy revealed that the polyether macrocycles rotate around the tetracationic macrocycle formed from 1 and 2.
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Ashton et al. (1991) studied this question.
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